连接 2 个表，但结果中存在条件列中的所有值

Question

I have 2 tables like below

id	score1
1	4
2	5
3	6

id	score2	score3
2	7	9
3	8	10
4	7	9
5	8	10

And I want to join them together to achive this result

id	score1	score2	score3	total
1	4	0	0	4
2	5	7	9	21
3	6	8	10	24
4	0	7	9	16
5	0	8	10	18

How ever, i have tried all join type but the id column have null values in them, can you guys show me the solution for this? Thanks all

Answer 1

 SELECT COALESCE(C.ID,C2.ID)ID,COALESCE(C.SCORE1,0)SCORE1,
 COALESCE(C2.SCORE2,0)SCORE2,COALESCE(C2.SCORE3,0)SCORE3,
 COALESCE(C.SCORE1,0)+COALESCE(C2.SCORE2,0)+COALESCE(C2.SCORE3,0) TOTAL
 FROM CTE AS C
 FULL JOIN CTE2 C2 ON C.ID=C2.ID
 ORDER BY ID

CTE - is yours first table(id,score1),CTE2 - second table(id,score2,score3)

Answer 2

select 
   coalesce(t1.id,t2.id) id
 , coalesce(t1.score1,0) score1
 , coalesce(t2.score2,0) score2
 , coalesce(t2.score3,0) score3
 , coalesce(t1.score1,0) + coalesce(t2.score2,0) + coalesce(t2.score3,0) total
from table1 t1
full outer join table2 t2 
 on t1.id = t2.id 

db<>fiddle here

Answer 3

You need to join in the ID. Something like this (not tested) :

SELECT
    t1.id,
    ISNULL(t1.score1, 0)
    ISNULL(t2.score2, 0)
    ISNULL(t2.score3, 0)
FROM table1 t1
LEFT JOIN table2 t2 ON t1.id = t2.id

LEFT JOIN instead of inner join or else you would only get lignes existing in t1